I'm not familiar with the particulars, but here are some histories of the 7th PA Cav:

Dornblaser, Thomas F., Sergeant, 7th Pennsylvania Cavalry. Sabre Strokes of the Pennsylania Dragoons in the War of 1861-1865. Philadelphia, 1884.

Sipes, William B. The Saber Regiment: History of the 7th Pennsylania Volunteer Cavalry. Blue Acorn. Reprint of 1905 Original

Sipes, William B. The Seventh Pennsylania Veteran Volunteer Cavalry, Its Record, Reminiscences and Roster. Pottsville, 1905.